package com.itheima.reggie.filter;
import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintStream;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器   用于匹配路径，支持通配符
        private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {


        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //A. 获取本次请求的URI
        String uri = request.getRequestURI();
        log.info("拦截请求：{}",uri);
        //B. 判断本次请求, 是否需要登录, 才可以访问
            String[] urls = {
                    "/employee/login",
                    "/employee/logout",
                    "/backend/**",
                    "/front/**",
                    "/commom/**",
                    "/user/sendMsg",
                    "/user/login"
            };
        boolean check = getaVoid(uri, urls);

        //C. 如果不需要，则直接放行
        if (check){
            log.info("本次请求不需要处理：{}",uri);
            //放行
            filterChain.doFilter(request,response);
            return;
        }
        //D. 判断登录状态，如果已登录，则直接放行
        Object employee = request.getSession().getAttribute("employee");
        if (employee!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //E. 如果未登录, 则返回未登录结果
        log.info("未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    private boolean getaVoid(String uri, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, uri);
            if (match){
                return true;
            }
        }
        return false;
    }
}
